Belt-tightening and speed-changing mechanism.



' F. E. MARGY.

BELT TIGHTBNING AND SPEED CHANGING MECHANISM. I 4

APPLICATION FILED MAY 28, 1906.

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r ATTORNEK P. E. MARGY, BELT TIGHTENING AND SPEED CHANGING MEOHANISM. APPLICATION I'ILED MAY 28, 1906.

919,048. Patented Apr. 20, 1909.

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ATTORNEY UNITED STATES PATENT OFFICE.

FRANK E. MARCY, OF SALT LAKE CITY, UTAH, ASSIGNOR TO ALLIS-OHALMERS'COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION OF NEW JERSEY.

BELT-TIGHTENING AND SPEED-CHAN GIN G MECHANISM,

To all whom it may concern:

Be it known that I, FRANK E. MAROY, citizen of the United States, residing at Salt Lake City, in the county of Salt Lake and State of Utah, have invented certain new and useful Improvements in Belt-Tightening and S eed-Changing Mechanism, of which the fo lowing is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention has relation to improvements in sus ended vanners, and it consists in the nove details of construction more fully set forth in the specification and pointed out in the claims.

In the drawings, Figure 1 is a side elevation of a vanner having my im rovement applied thereto Fig. 2 is a top p an of one-half of the vanner; Fig. 3 is a vertical transverse section on line 33 of Fig. 1; Fig. 4 is a front end view of the machine; Fig. 5 is an enlarged side elevation of the features embodying my invention; Fig. 6 is a vertical sectional detail on line 66 of Fig. 5, and Fig. 7 is a perspective of a section of the belt-shifting shaft and the shifting fork.

The present invention is directed to improvements in suspended vanners and has for its object the improvement of the vanner in certain specific details among which may be mentioned the following; the details for effecting a gravity tightening of the conepulley belt; the means for changing the speed of the vanner belt on which the material is treated; the means for protecting the belt-shifting mechanism against the water, grit, and slime of the vanner; and other details and features of construction whose advantages will be more fully apparent from a detailed description of the invention which is as follows:

Referring to the drawings P, P represent respectively rear and front corner posts between which the vanner belt is mounted and which constitute arts of the vanner frame. Depending from t e upper inwardly curved ends of the posts P, P, are the laterally oscillating links or hangers 1, 1, from which is suspended the frame F carrying the several drums over which travels the vanner-belt B. On one side of the vanner between the posts P, P, is mounted the drive-shaft 2 carrying a belt pulley 3 from which leads a belt 4 to any source of power, (not shown), the said shaft terminating in eccentrics 5, 5, which through Specification of Letters Patent.

Application filed May 28, 1906.

Patented April 20, 1909.

Serial No. 319,143.

the medium of the straps 6, 6, and connecting rods 7, 7 coupled to the frame F impart a laterally reciprocating movement to the frame and hence to the vanner-belt as the latter trayels longitudinally in the operation of the concentrator.

The parts just referred to, and other parts shown but to which no reference is made are well known and understood and require no explanation, entering as they do into the construction of all vanners of the suspended type.

Mounted on the shaft 2 at a point between the pulley 3 and the post P is a cone-pulley 8 from which leads a belt 9 over a cone-pulley 10 on the inner section of a universallyjointed shaft 11, the joints 12 dividing the shaft into three sections, the terminal of the outer section carrying a worm wheel 13 which meshes with a gear 14 at the end of the shaft of the upper forward drum of the vanner-belt. The jointed shaft 11 is supported in a bearing 15 on the frame F at the forward end, and in bearings 16, 16, at its rear, the bearings 16, 16 being secured tothe vertically oscillating structural member 17 preferably of the angle-bar type. The member 17 is capable of vertical oscillation about a pivotal pin 18 at the rear end of said member which couples it to the post P. The forward end by reason of the oscillation referred to is capable of vertical adjustment along the post P; and when once adjusted can if desired be secured to the post by means of the hand-wheel nut 19 passed over the screwthreaded portion of a laterally projecting bolt 20 secured to the structural member and operating in the vertical slot 21 of said post P.

From the foregoing it will be seen that ordinarily, or if previously secured then by loosening the nut 19, the full weight of the structural member will draw on the belt 9 and thus effect a tightening of the belt by gravity. On the other hand we can drop or adjust the movable end of the structural member to any desired extent to effect any predetermined tightening of the belt, and when in its adjusted position, we can if desired securely clamp it in that position by driving home the nut 19 against the post P.

From the connections described, it will be seen that motion of rotation imparted to the drive-shaft 2 will be communicated through the pulleys 8, 10, and belt 9 to the shaft 11, which, imparting rotation to the worm 13 Will rotate the gear 14 and thus impart the necessary longitudinal travel to the vannerbelt. At the same time the belt will be reciprocated laterally by the eccentrics 5, 5, as already described. During the longitudinal travel of the belt B it may be necessary to vary the speed of this travel and to accomplish this in a quick and economic manner I provide the following mechanism: Mounted in suitable bearings on the structural member 17, and protected by the overhanging horizontal leg thereof from the slime and dirt and Water of the vanner-belt, is a rotatable belt-shifting shaft 22 terminating at one end in a hand-Wheel 23, the rear section of the shaft having a screw-thread d portion 22 over which travels a nut 24 provided With a rib 241 operating in a longitudinal slot 2' of the vertical leg of the structural member, said rib having secured thereto the fork 26 by which the belt is directly shifted. It will be seen that a rotation of the shaft 22 by the hand-wheel 23 in either direction, Will shift the nut 24 and the fork 26 along the slot 25 in either direction, thereby shifting the belt 9 along the pulleys 8, 10, to effect an increase or reduction in the speed of the pulley 10 and a corresponding variation in the speed of travel of the vanner-belt.

It Will be seen that the structural member 17 not only serves to support the lower conepulley Whose vertical elevation determines the tension of the belt 9, but likewise serves to support the belt-shifting shaft 22 Which determines the speed at which the pulley (10) shall revolve, and, hence the speed of travel of the vanner-belt. In fact the entire control both as to speed and belt-tension adjustment is centered in the structural member 17.

This construction forms a simple and cheap device in connection with the construction of existing vanners, and may be resorted to Without any material alterations in machines already in use or operation.

To protect the belt 9 and the pulley 10 and its bearings 16, 16, from the dirt and grit, I secure to the bearings 16, a shield 27 as shown.

Having described my invention What I claim is:

1. The combination of a frame, a drive shaft thereon, a pulley on said drive shaft, a second pulley automatically movable to different levels, a belt sustaining said second pulley and connecting it to said drive shaft pulley, a driven shaft, and a jointed shaft connecting said second pulley and said driven shaft.

2. The combination of a frame, a drive shaft thereon, a pulley on said drive shaft, a member on said frame, a pulley on said memher, a belt connecting said pulleys, one of said pulleys being a cone pulley and said member being automatically movable to tighten said belt, means for shifting said belt, a driven shaft, and a jointed shaft connecting said second pulley and said driven shaft.

3. The combination of a frame, a drive shaft thereon, a pulley on said drive shaft, a member on said frame, a pulley on said memher, a belt connecting said pulleys, one of said pulleys being a cone pulley and said member being automatically movable to tighten said belt, screw means on said memher for shifting said belt, a driven shaft, and a jointed shaft connecting said. second pulley and said driven shaft.

4. The combination of a frame, a drive shaft thereon, a pulley on said drive shaft, a member on said frame and having an oven hanging portion, a pulley on said member, a belt connecting said pulleys, one of said pulleys being a cone pulley and said member being automatically movable to tighten said belt, screw belt shifting means mounted underneath said overhanging portion, means for actuating said screw means from one end of said member for shifting said belt, a driven shaft, and a jointed shaft connecting said second pulley and said driven shaft.

In testimony whereof I affix my signature, in presence. of two witnesses.

F LANK IVZARCY. witnesses Gnonen O. BRADLEY, GEO. W. RITER. 

